Three independent security hardenings from cross-cutting audits.
1. cortex /term PTY env leak + bind guard (HIGH — Sonnet Cross-cutting + Opus)
- kei-cortex/src/handlers/term_pty.rs: PTY spawn was inheriting daemon's
full process env (KEI_AUTH_KEY, ANTHROPIC_API_KEY, FAL_KEY, etc.) into
every authenticated /term shell. Combined with default cors_origin =
https://keisei.app, one stored XSS on keisei.app + one bearer token =
full local shell with all daemon secrets.
Added apply_safe_env() helper: env_clear() + re-set only HOME, PATH,
USER, LANG, TERM. Spawn helper invokes it before spawn_command.
- kei-cortex/src/main.rs: extracted build_config() helper; added
enforce_loopback_or_local_cors() guard called before serve.bind. Refuses
to start if bind addr is non-loopback AND cors_origin is a public
domain — prevents the XSS-to-shell scenario in production.
2. agent-stub-scan.sh stdin parsing (HIGH — multiple audits)
- hooks/agent-stub-scan.sh: previously read $CLAUDE_AGENT_TRANSCRIPT env
var which Claude Code does NOT set on PostToolUse:Agent. Hook silently
exited 0 — RULE 0.16 enforcement was dead-code in production.
Rewrote to read stdin JSON via jq, flatten .tool_response recursively
(string|array|object via the same pattern as agent-event-done.sh),
guard on .tool_name == "Agent" and command -v jq. Maintained WARN-tier
exit-0 with TODO marker for ENFORCE flip on 2026-05-05 (per RULE 0.16
§2 ladder).
3. magiclink revoke() silent no-op (HIGH — Opus Rust + Sonnet Cross-cutting)
- kei-auth-magiclink/src/{error,provider}.rs: revoke() previously returned
Ok(()) without doing anything. Operators expecting "revoke a session"
semantics from the AuthProvider trait got false success. Stolen magic-
link URLs remained valid until the 15-minute TTL.
Added Error::Unsupported variant. revoke() now returns
Err(Unsupported(...)) with explicit guidance: "rotate KEI_MAGICLINK_HMAC_
KEY to invalidate all live tokens, or maintain a deny-list at the caller
layer". Test provider_revoke_returns_unsupported_error confirms the
error variant is wired.
Tests: cargo check + cargo test both PASS. 444 functional tests across
kei-cortex (428 lib) + kei-auth-magiclink (16 lib + smoke). Pre-existing
openai_loop_wiring.rs 502 failures in routes/openai/{chat,responses}.rs are
NOT introduced by these fixes — separate unrelated triage.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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